Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2015	$ 197,835	$ 8,605	$ 75,375	$ 111,565	$ 2,290
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	16,301			16,301
Other comprehensive loss	(4,164)				(4,164)
Stock repurchased	(1,292)	(51)	(1,241)
Stock options exercised	142	6	136
Vesting of restricted stock		5	(5)
Equity-based compensation	824	13	811
Cash dividends paid	(8,266)			(8,266)
Ending Balance at Dec. 31, 2016	201,380	8,578	75,076	119,600	(1,874)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,249			15,249
Other comprehensive loss	(657)				(657)
Reclass stranded tax effects from tax rate change				545	(545)
Stock options exercised	113	5	108
Vesting of restricted stock		8	(8)
Equity-based compensation	1,016	13	1,003
Cash dividends paid	(8,384)			(8,384)
Ending Balance at Dec. 31, 2017	208,717	8,604	76,179	127,010	(3,076)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,579			22,579
Other comprehensive loss	(2,109)				(2,109)
Reclass stranded tax effects from tax rate change	(650)
Stock options exercised	861	35	826
Vesting of restricted stock		13	(13)
Equity-based compensation	1,196	16	1,180
Cash dividends paid	(8,702)			(8,702)
Ending Balance at Dec. 31, 2018	$ 222,542	$ 8,668	$ 78,172	$ 141,537	$ (5,835)